Method of working blast furnaces



May 14, 1929. P. HESKAMP 3,436

METHOD OF WORKING BLAST FURNACES Filed Nov. 5, 1926 Patented May 14, 1929.

UNITED STATES PATENT OFFICE.

PAUL HESKAHP, OF DUISBIIBG-BUfiBOBT, GERMANY, ASSIGNOR TO THE FIRM VEBEIN IGTE STAL'HLWEBKE AKTIENGESELLSCHAFT, OF DUSSELDORF, GERMANY.

METHOD WORKING BLAST FURNACES.

Application filed November 5, 1926, Serial No. 146,563, and in Germany September 8, 1926.

This invention relates to an improved method of blowing'various charging materials into blast furnaces above the smelting zone therein with the aid of non-oxidizing gases, while furthermore said materials,

prior to their being blown-in, can be intimately mixedwith furnace dust, suitably during their required crushing.

Above the already known proposals of lo blowing the various charging materials (fuels as well as the materials to be smelted) into the smelting zone with the aid of the blowerair, the improvedimethod has the advantage that an undisturbed introduction of all said materials is ensured and, before all, a clogging of the feed'nozzles is impossible due to their cold working, so that even those materials can be blown-in which must not be supplied to hot nozzles owing to their strong inclination of sintering.

A further advantage of the improved method consists in the fact'that for each single charging material the most favour able place for blowing it into the shaft furnace can be, chosen at will. a

As a further improvement,-the various.

charging materials are intimately mixed with furnace dust, whereby disturbances due to baking or caking of said materials are cffectively avoided. This is of particular importance inasmuch'as the blowing-in of the-charging materials can be effected with the aid of comparatively cold gases into comparatively cool zones of the furnace by means of rather primitive blowers such as,

"for instance, known as sand blast apparatus I or the like and which work undisturbedly without artificial production of static pressure of the materials supplied, as long as care is taken for a good feeding capacity of the blowing agent.

Of course, the improved method can also be employed for introducing particularly valuable additions or brittle additions in 4:, sucha way that they pass without any material loss with the descending charge to' the reaction zone in the furnace.

Suitably, the intimate mixin of the various charging materials with urnace dust, for ensuring their uniform feeding capacity, can take place during their crushing, if this is required, a particularly sharp drying of the materials, prior to their being blownin, being then unnecessary.

5, The accompanying drawing shows, in a practice.-

diagrammatical side view, by way of example how the invention can be put into The reference numerals therein designate: 7

1 the blast-furnace, 2 the upperedge of the charging gallery, 3 the gastake, 4 the gas conduit, and 5 the dust pocket, from which- From the mixing vessel 14 the mixture pass-1 es into the container 7 from which it is blown b compressed blast-furnace. gas through t e pipes 8 and 9 at 10 into the blastfurnace 1 above the smelting zone into zones,

from which it cannot escape with the gas current,

In order to prevent a destruction of the dust pocket 5 by'explosions therein, said dust pocket is fitted with a let-off pipe 11 carrying an explosion flap 12 through which explosion gases can escape into the open air.

' A branch pipe 13 of the pipe 8 serves for letting-off any excessive gas pressure in said pipe. A

Itmust be noted that due to the feed nozzles remaining cold and due to the lack of oxidizing gases in and in front of the nozzles, no regard need to be paid, when composing the mixture, to the behaviour of the latter in the heat, as would be required when blowing it into the combustionzone.

What I claim, is

with furnace dust'prior to their being blownin and during their required crushing.

In testimony whereof I have hereunto set my hand.

' PAUL'HESKAMP. 

